Defile

Target creature gets -1/-1 until end of turn for each Swamp you control.

Trespasser's Curse

Enchant player
Whenever a creature enchanted player controls enters, that player loses 1 life and you gain 1 life.

Pestilence

At the beginning of the end step, if no creatures are on the battlefield, sacrifice Pestilence.
{B}: Pestilence deals 1 damage to each creature and each player.

You Are Already Dead

Destroy target creature that was dealt damage this turn.
Draw a card.

Undercity Scrounger

{T}: Create a Treasure token. Activate only if a creature died this turn. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")

Crypt Ripper

Haste
{B}: Crypt Ripper gets +1/+1 until end of turn.

Night Market Lookout

Whenever Night Market Lookout becomes tapped, each opponent loses 1 life and you gain 1 life.

Cemetery Gate

Defender (This creature can't attack.)
Protection from black

Geth's Verdict

Target player sacrifices a creature of their choice and loses 1 life.

Cuombajj Witches

{T}: Cuombajj Witches deals 1 damage to any target and 1 damage to any target of an opponent's choice.

Blood Pact

Target player draws two cards and loses 2 life.

Chittering Rats

When Chittering Rats enters, target opponent puts a card from their hand on top of their library.

Soulcage Fiend

When Soulcage Fiend dies, each player loses 3 life.

Phyrexian Rager

When Phyrexian Rager enters, you draw a card and you lose 1 life.

Nausea

All creatures get -1/-1 until end of turn.

Thorn of the Black Rose

Deathtouch
When Thorn of the Black Rose enters, you become the monarch.

Swamp

Sign in Blood

Gray Merchant of Asphodel

When Gray Merchant of Asphodel enters, each opponent loses X life, where X is your devotion to black. You gain life equal to the life lost this way. (Each {B} in the mana costs of permanents you control counts toward your devotion to black.)

Diabolic Edict

Target player sacrifices a creature of their choice.

Wicked Akuba

{B}: Target player dealt damage by Wicked Akuba this turn loses 1 life.

Piranha Marsh

Piranha Marsh enters tapped.
When Piranha Marsh enters, target player loses 1 life.
{T}: Add {B}.

Thieves' Tools

When Thieves' Tools enters, create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")
Equipped creature can't be blocked as long as its power is 3 or less.
Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)

Dauthi Slayer

Shadow (This creature can block or be blocked by only creatures with shadow.)
Dauthi Slayer attacks each combat if able.

Duress

Target opponent reveals their hand. You choose a noncreature, nonland card from it. That player discards that card.

Clawing Torment

Enchant artifact or creature
As long as enchanted permanent is a creature, it gets -1/-1 and can't block.
Enchanted permanent has "At the beginning of your upkeep, you lose 1 life."

Crypt Incursion

Exile all creature cards from target player's graveyard. You gain 3 life for each card exiled this way.